In 35 ABY, the current time in most recent novels, Boba Fett is 67. Born in 32 BBY.
Han Solo is only 3 years younger but he's still active in recent Novels. Harrison Ford is 63 in real life too.

He's 10 or 11 (at least according to the age of the actor who played young Boba) in AOTC. That's 22 or 23 years before ANH (Battle of Yavin?) so that's pretty close. So he's 32-35 in ANH, 35-38 in ESB (the age Jango is supposed to be in AOTC iirc), and 36-39 in ROTJ. If we take the EU storyline that he survived the Sarlacc then he's 67-70 in the "most current novels."